Answer
$2.02\times10^{-5}$
Work Step by Step
Using $a\times10^n$, where $1\le a\le9,$ and $n$ is an integer, the scientific notation of the given expression, $
0.0000202
,$ is
\begin{array}{l}\require{cancel}
2.02
\div100000
\\\\=
2.02\times10^{-5}
.\end{array}